Synthesis of nanoporous materials for preconcentration and determination of trace elements by ICP-AES ; Investigation and elimination of the memory effects of mercury, gold, silver and boron in ICP-AES

dc.contributor.author

Chen, Wencan.

en_US

dc.date.accessioned

2009-07-09T18:43:11Z

dc.date.available

2009-07-09T18:43:11Z

dc.date.issued

1999-07-09T18:43:11Z

dc.identifier.uri

http://hdl.handle.net/10464/2086

dc.description.abstract

Nanoporous materials with large surface area and well-ordered pore structure
have been synthesized. Thiol groups were grafted on the materials' surface to make
heavy metal ion pre-concentration media. The adsorption properties ofthe materials were
explored. Mercury, gold and silver can be strongly adsorbed by these materials, even in
the presence of alkaline earth metal ion. Though the materials can adsorb other heavy
metal ions such as lead and copper, they show differential adsorption ability when several
ions are present in solution. The adsorption sequence is: mercury> == silver> copper »
lead and cadmium.
In the second part of this work, the memory effects of mercury, gold, silver and
boron were investigated. The addition of 2% L-cysteine and 1% thiourea eliminates the
problems of the three metal ions completely. The wash-out time for mercury dropped
from more than 20 minutes to 18 seconds, and the wash-out time for gold decreased
from more than 30 minutes to 49 seconds. The memory effect of boron can be reduced by
the use of mannitol.

en_US

dc.language.iso

eng

en_US

dc.publisher

Brock University

en_US

dc.subject

Porous materials.

en_US

dc.subject

Nanostructured materials.

en_US

dc.subject

Heavy metals.

en_US

dc.subject

Adsorption.

en_US

dc.subject

Inductively coupled plasma atomic emission spectrometry.

en_US

dc.title

Synthesis of nanoporous materials for preconcentration and determination of trace elements by ICP-AES ; Investigation and elimination of the memory effects of mercury, gold, silver and boron in ICP-AES